Java如何检查端口是否被使用？

解决方法

下面的示例演示如何通过创建一个套接字对象检查端口是否被服务器使用。

import java.net.*;
import java.io.*;

public class Main {
   public static void main(String[] args) {
      Socket Skt;
      String host = "localhost";
      if (args.length gt; 0) {
         host = args[0];
      }
      for (int i = 0; i < 1024; i++) {
         try {
            System.out.println("Looking for "+ i);
            Skt = new Socket(host, i);
            System.out.println("There is a server on port "
            + i + " of " + host);
         }
         catch (UnknownHostException e) {
            System.out.println("Exception occured"+ e);
            break;
         }
         catch (IOException e) {
         }
      }
   }
}

结果

上面的代码示例将产生以下结果。

Looking for 0
Looking for 1
Looking for 2
Looking for 3
Looking for 4. . .